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Callback File System lets you create virtual file systems and disks that meet your requirements, giving you full control over your data.
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Callback File System lets you create virtual file systems and disks that meet your requirements, giving you full control over your data.

Virtual File System is a filesystem that doesn't reside on a partition of a "physical" disk or a disk partition. VFS hides the location (and format) of the actual data storage from the system and the applications.

The actual data that make a filesystem can be located in files spread across the local disks or in applicaiton resources or in memory or somewhere at a remote location. Moreover, using a virtual filesystem you can modify the data being read from or written to the virtual filesystem and such modifications are completely transparent for the applications. At the same time, the operating system and the applications "see" the virtual disk as a local disk device.

Virtual filesystem can be indispensable in various scenarios. The examples of use are:

  • document management systems, which keep document versions in the centralized database and must keep control over the data which is saved and loaded;
  • applications which provide remotely-located disks to the local user (various *FTPDrive applications, WebDAV systems etc);
  • applications which let the users manage the remote data storages (eg GMail access application that lets the users view e-mail as files);
  • porting of applications, that use FUSE software, from Linux;

Creation of virtual filesystems in modern operating systems like Windows is possible due to existence of the model of low-level (kernel-mode) drivers. Development of such driver, that requires deep knowledge of the operating system internals, is a challenging task even for experienced developers. Besides complexity, driver development is a very time-consuming process.

Callback File System is an SDK (Software Development Kit) which opens the way to create your own filesystems with little or no efforts. The product includes ready-to-deploy kernel-mode device driver and a user-mode API, which is used by your application. The driver creates a virtual disk with your filesystem and provide system-wide access to the disk. The API lets you manage the driver and the virtual disk from any Windows or .NET application.

With Callback File System you can run your filesystem code in user mode, letting the driver to deal with complexities of the kernel mode.

Supported platforms

The drivers and user-mode API can be used on Windows 2000, Windows XP, Windows 2003 Server, Windows Vista and Windows 2008 Server.Both 32-bit and 64-bit (AMD64) systems are supported.
.NET user mode API requires .NET 1.1, .NET 2.0, .NET 3.0 or .NET 3.5.

Supported development tools

.NET component can be used with Visual Studio 2008, Visual Studio 2005 or Visual Studio .NET 2003.
C++ library can be used with Visual Studio 6 or later.
VCL component is available for Delphi 5 to 2007, BDS 2006 (Delphi and C++ personalities), C++Builder 5 and 6, C++Builder 2007.

For Linux developers

If you are looking for FUSE For Windows (FUSE is File System In User Space, a Linux library for creating file systems), look no further. Callback File System provides the same functionality on Windows.